The number of horses that perished in a massive barn fire in McHenry County, Illinois, on Wednesday stands at 18.
Many of the dead horses are reported to be Arabians.
Fire investigators said the cause could not at this stage be established definitively, but it was considered accidental.
In all, 22 horses were saved from the early-evening blaze, and all are reported to be well.
It is believed that all horses are now accounted for.
There were 40 animals in the 64-stall barn at the time of the blaze, which razed the Black Tie Stable at 101 W. Bay Road, east of Johnsburg, on Wednesday about 5pm.
Two of those who helped rescue horses were taken to hospital for treatment for smoke inhalation.
Black Tie Stables is operated by Richard Wright, who trains and shows arabian and part arabian horses.
The fire is believed to have started in the southeast corner of the stable, which measured 80 metres long by 40 metres wide.
The absence of hydrants in the area meant 21 fire departments turned out to fight the blaze.